When organisms of one adaptive radiation resemble with the organisms of another adaptive radiation, than it is called:

Options

A. Convergent evolution
B. Divergent evolution
C. Retrogressive evolution
D. Mega evolution

Answer

**Step-by-Step Solution:**

1. **Understanding Adaptive Radiation**: Adaptive radiation refers to the process by which organisms diversify rapidly into a variety of forms to adapt to different environments. This often occurs when a species colonizes a new habitat with various ecological niches.

2. **Identifying the Key Concept**: The question asks about the resemblance between organisms from different adaptive radiations. This indicates that we are looking for a term that describes how different species, which have evolved in separate adaptive radiations, exhibit similar traits or characteristics.

3. **Examples of Adaptive Radiation**: The transcript provides examples of marsupials and placental mammals. For instance, marsupial moles and placental moles show similar adaptations despite being from different lineages. This similarity arises because they have adapted to similar ecological niches.

4. **Defining Convergent Evolution**: The term that describes this phenomenon is "convergent evolution." Convergent evolution occurs when unrelated or distantly related organisms evolve similar traits as a result of adapting to similar environments or ecological niches.

5. **Conclusion**: Therefore, when organisms from one adaptive radiation resemble organisms from another adaptive radiation, it is termed as "convergent evolution."

**Final Answer**: Convergent evolution.

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